1732 - non-fixed style tabs with scrolling

[KaneFreeman]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit tests are included in the PR
• [ ] For new widgets, an entry has been added to the .dojorc
• [ ] For new widgets, theme.variant() is added to the root domnode
• [ ] Any widget variant uses theme.compose like this
• [ ] WidgetProperties are exported

Description:

• Add variable width tab style
• Add new fixed property to toggle between the two styles
• Make tables scrollable when in variable width mode

Resolves #1732

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widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/9qczevn4naRCysFf2xGQmPbptRAf
✅ Preview: https://widget-test-do-git-fork-kanefreeman-feature-1732-non-fix-b98c33.vercel.app

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/Dk2NicCmjhVpvgJGMNmWdbRbXKJp
✅ Preview: https://dojowidgets-git-fork-kanefreeman-feature-1732-non-fix-f81a2c.vercel.app

[codecov[bot]]

Codecov Report

Merging #1747 (6db473f) into master (d543a3f) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1747      +/-   ##
==========================================
+ Coverage   90.43%   90.46%   +0.03%     
==========================================
  Files          94       94              
  Lines        5143     5152       +9     
  Branches     1403     1406       +3     
==========================================
+ Hits         4651     4661      +10     
  Misses        241      241              
+ Partials      251      250       -1     

Impacted Files	Coverage Δ
src/tab-container/index.tsx	90.56% <100.00%> (+0.87%)	:arrow_up:
src/middleware/offscreen.ts	100.00% <0.00%> (+6.25%)	:arrow_up:

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